Assuming that you have Huck brakes, I will ask a stupid question. Take no offense please.
Are you adjusting both stars on each wheel?
One thing that I have found beneficial for bleeding Huck brakes after major changes (new shoes, turned or new drums), is to adjust one star until you can barely turn the wheel, then back it off until you can just turn the wheel with some drag. Do this with all eight stars. This will take all of the mechanical slop out of the shoes, allowing them to solidly contact the drums without excessive pedal travel..
Now double check the master cylinder push rod adjustment as per The Manual.
After this, bleed the brakes.
Once you have a high, firm pedal, adjust the brakes as per The Manual. There will be no brake drag after this adjustment.
If none of this works, you need a new master cylinder even if the one you currently have is new, All too often, we find bad new master cylinders for every vehicle made these days.
Carl
